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I have a big problem with slow oracle jobs on our production db, about a month ago, daily updates to a table started slowing up. By this i mean that they used to run every morning and be updated by around 9.30, but now they dont finish completion till 2.00 - 3.00,

The Loads have not increased in size?
I query the V$Transaction, & check the User_jobs views, there is noting in the V$transaction, and the user_jobs shows up as having run w/o any difficulties,

in the session menu there are circa 50 sessions, with mostly inactive or killed status? Is this slowing progress? If so how do i get rid of these completely?

You have to see all select, insert or update in this program to database and see if anyone is very slowly. I had a similar problem because a table have not an index and when the table was very large one select was very slowly.